US11617448B2

Movatterモバイル変換

Info

Publication number: US11617448B2
Application number: US16/993,368
Authority: US
Inventors: Luhao Leng
Original assignee: New Tec Integration Xiamen Co Ltd
Current assignee: New Tec Integration Xiamen Co Ltd
Priority date: 2019-08-14
Filing date: 2020-08-14
Publication date: 2023-04-04
Also published as: US20210045537A1; CN112386045B; CN112386045A

Abstract

A bed frame has a left longitudinal support bar, a right longitudinal support bar and an intermediate longitudinal support bar, two sliding sleeves slidably disposed on the intermediate longitudinal support bar, wherein each of the sliding sleeve is provided with a bracket. The bed frame further comprises four connecting rods connected between the left longitudinal support bar or right longitudinal support bar and the intermediate longitudinal support rod, one end of each of the connecting rods is pivotally connected to the left or right longitudinal support bar, the other end is pivotally connected with the bracket so that the end of the connecting rod mounted on the bracket moves along with the sliding sleeve. The bed frame is simple and easy to fold and un-fold, while providing improved strength and stability.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of Chinese Patent Application No. 201910750491.4, filed Aug. 14, 2019, which is incorporated herein by reference in its entirety.

FIELD OF THE DISCLOSURE

The present disclosure relates to the field of furniture, and in particular to a bed frame.

BACKGROUND OF THE DISCLOSURE

Foldable beds have become popular furniture products. However, the folding function of the existing foldable beds is usually not ideal, and they may lack sufficient rigidity and stability. Further, since existing bed frames are sold as a whole after the completion of assembly at the factory, consumers can use and store the bed frames only by folding and unfolding the bed frames, but cannot detach or dis-assemble elements of the bed frame. Thus, existing folding bed frames tend to be bulky, requiring excessive storage space and transportation costs.

Accordingly, improved folding bed frames are needed.

SUMMARY OF THE DISCLOSURE

A main object of the present disclosure is to provide a bed frame enabling a user to quickly and effectively fold the bed frame. The space occupied by the collapsed bed frame is small. Further, the folding process is relatively simple and easy to implement. Furthermore, the bed frame exhibits larger strength and better stability, so that the bed frame can bear a larger weight in either the deployed state or collapsed state, and thus can satisfy multiple demands of the users.

An aspect of the present disclosure provides a bed frame, comprising:

a left longitudinal support bar and a right longitudinal support bar which are located at a left side and a right side of the bed frame respectively and extend in a longitudinal direction of the bed frame;

an intermediate longitudinal support bar disposed between the left longitudinal support bar and the right longitudinal support bar and extending in the longitudinal direction of the bed frame,

wherein the bed frame further comprises:

two spaced-apart sliding sleeves slidably disposed on the intermediate longitudinal support bar, wherein each of the sliding sleeves is provided with a bracket; and

four connecting rods comprising two left connecting rods extending between the left longitudinal support bar and the intermediate longitudinal support bar and two right connecting rods extending between the right longitudinal support bar and the intermediate longitudinal support bar, wherein one end of each of the connecting rods is pivotally attached to one end of the left longitudinal support bar or the right longitudinal support bar, and the other end of the each of the connecting rods is pivotally attached to the bracket of a corresponding sliding sleeve,

wherein each of the connecting rods is configured so that its end mounted on the bracket moves along with the corresponding sliding sleeve when the sliding sleeve slides along the intermediate longitudinal support bar, thereby driving the connecting rod to move on a horizontal plane, as a result of which the bed frame is formed in a deployed state or a collapsed state.

According to another embodiment of the present invention, the intermediate longitudinal support bar is disposed with pin holes at positions close to its end portions and a middle portion respectively, and a pin is disposed in each of the pin holes, and the pin is configured to extend out of the pin hole under the action of an elastic force and retract back into the pin hole when being subject to a pressure.

According to a further embodiment of the invention, a receiving hole is disposed on a side surface of each of the sliding sleeves facing the pin holes, wherein the receiving hole is configured to allow the pin to extend out of the pin hole under the action of its elasticity when the receiving hole is aligned with the pin, and then automatically enter into the receiving hole to lock the sliding sleeve on the intermediate longitudinal support bar.

According to a further embodiment of the invention, the positions of the pin holes at the end portions of the intermediate longitudinal support bar are set such that the connecting rods are perpendicular to the intermediate longitudinal support bar when the connecting rods are locked on the intermediate longitudinal support bar; and the position of the pin hole at the middle portion of the intermediate longitudinal support rod is set such that the connecting rods and the intermediate longitudinal support bar abut against one another side by side when the connecting rods are locked.

According to a further embodiment of the invention, the pin is a square pin or a round pin.

According to a further embodiment of the invention, the pin holes are disposed on an upper surface and/or a lower surface of the intermediate longitudinal support bar.

According to a further embodiment of the invention, each of the brackets is mounted on a corresponding sliding sleeve, and each of the brackets is provided with two pivot shafts, each of which is located at a lateral side of the sliding sleeve and extends in a vertical direction. The connecting rod is pivotally connected to the bracket via one of pivot shafts located at the same side of the connecting rod.

According to an embodiment of the invention, the bracket comprises an upper board mounted on an upwardly facing surface of the sliding sleeve and a lower board fixedly mounted on a downwardly facing surface of the sliding sleeve, both lateral sides of the upper board and lower board respectively extend out of the sliding sleeve to form cantilevers, and the pivot shafts are disposed between the cantilevers formed at the same sides of the upper board and lower board.

According to a further embodiment of the invention, the upper board comprises two horizontal meshing plates which are respectively pivotally mounted on the top ends of the two pivot shafts, the meshing plates are in a sector shape and are provided with a gear structure at their arcuate edges which are arranged to face each other, such that the gear structures of the meshing plates can mesh with each other when the meshing plates are pivotally rotated around the pivot shafts, thereby enabling synchronous rotation of the two connecting rods connected to the sliding sleeve.

According to a further embodiment of the invention, the end of the connecting rod connected to the sliding sleeve has an upper side plate and a lower side plate which extend in the horizontal direction and face each other, and the pivot shaft is extended between the upper side plate and the lower side plate. The bracket includes a bearing frame and a retaining plate, wherein the bearing frame is fixedly mounted at a lower side of the sliding sleeve and is projected laterally relative to the sliding sleeve so that it can support the lower surface of the lower side plate, and the retaining plate is positioned above the lower side plate so that the lower side plate is sandwiched between the retaining plate and the bearing frame in order to achieve position limitation of the end of the connecting rod connected to the sliding sleeve in the vertical direction.

According to a further embodiment of the invention, the upper side plate is formed into a partially circular shape with a gear structure formed at a actuate edge, wherein racks extending in the longitudinal direction of the bed frame is disposed at both lateral upper edges of the sliding sleeve respectively, and the gear structures of the respective upper side plates of two connecting rods can respectively mesh with corresponding racks so that the two connecting rods connected to the sliding sleeve can rotate synchronously.

According to a further embodiment of the invention, each of the left longitudinal support bar, the right longitudinal support bar and the intermediate longitudinal support bar comprises two main body sections and an intermediate section connected between the two main body sections, the main body sections and the intermediate section are connected via a connecting sheet disposed with a support bar pivot shaft, wherein the two main body sections are configured to be capable of rotating relative to each other about their respective support bar pivot shafts in a vertical plane relative to the intermediate section so that the bed frame is collapsed or developed in the vertical plane.

According to a further embodiment of the invention, the bed frame further comprises locking means for locking the main body sections relative to the intermediate section when the main body sections rotate in the vertical plane to the collapsed or deployed position.

According to a further embodiment of the invention, the connecting rod comprises a plurality of bushings which are nested one inside another so that the connecting rod can be telescoped in its extension direction.

According to a further embodiment of the invention, in any two adjacent bushings, one is provided with a first alignment hole in which a ball end leaf spring with a protrusion is disposed, the ball end leaf spring is configured to extend out of the first alignment hole under an action of an elastic force and retract back into the first alignment hole when it is subjected to a pressure, the other one of the two adjacent bushings is nested on the first one of the bushings and is disposed with a second alignment hole on its side face opposite to the first alignment hole, the second alignment hole is configured so that when the second alignment hole is aligned with the protrusion, the protrusion can extend out under the action of elasticity, automatically enter the second alignment hole and thereby lock the two adjacent bushings relative to one another.

According to a further embodiment of the invention, the bed frame is configured to be engageable with tongue members for mounting a bedhead member, wherein each of the tongue members comprises a tongue, an upwardly opened slot is provided at the end of the left longitudinal support bar and right longitudinal support bar respectively, and the slot is configured to receive the tongue.

According to a further embodiment of the invention, the left longitudinal support bar, the right longitudinal support bar, and the intermediate longitudinal support bar are respectively provided at both ends and in the middle with legs extending downwardly.

In one embodiment, the legs are also pivotally connected to respective longitudinal support bars, and are rotatable and foldable relative to the respective longitudinal support bars, and in the collapsed state the legs abut against the respective longitudinal support bars side by side.

Another aspect of the present disclosure provides a bed frame, comprising:

a left longitudinal support bar and a right longitudinal support bar which are located on either of lateral sides of the bed frame respectively and extend in a longitudinal direction of the bed frame;

wherein the bed frame further comprises:

four sliding sleeves, wherein two sliding sleeves are disposed spaced apart on the left longitudinal support bar and capable of sliding on the left longitudinal support bar, and the other two sliding sleeves are disposed spaced apart on the right longitudinal support bar and capable of sliding on the right longitudinal support bar, wherein a bracket is disposed on the sliding sleeve; and

four connecting rods comprising two left connecting rods extending between the left longitudinal support bar and the intermediate longitudinal support bar and two right connecting rods extending between the right longitudinal support bar and the intermediate longitudinal support bar, wherein one end of each of the connecting rods is pivotally attached to an end of the intermediate longitudinal support bar about a pivot shaft, and the other end of the connecting rod is pivotally attached to a corresponding bracket,

wherein the connecting rod is configured so that the end of the connecting rod mounted on the bracket moves along with the sliding sleeve when the sliding sleeve slides along the left longitudinal support bar or right longitudinal support bar, thereby driving the connecting rod to move on a horizontal plane to make the bed frame to be in a deployed state or a collapsed state.

According to a further embodiment of the invention, a pin hole is disposed respectively on the left longitudinal support bar and right longitudinal support bar at positions close to their end portions and middle portion and at a transition position between the end portions and the middle portion, wherein a pin is disposed in each of the pin holes, and the pin is configured to extend out of the pin holes under the action of an elastic force and retract back into the pin holes when being subject to a pressure.

According to a further embodiment of the invention, a receiving hole is disposed on a side of the sliding sleeve opposite to the pin hole, wherein the receiving hole is configured to allow the pin to extend out under the action of its elasticity when the receiving hole is aligned with the pin, and automatically enter the receiving hole to lock the sliding sleeve on the corresponding left longitudinal support bar or right longitudinal support bar.

According to a further embodiment of the invention, the pin holes are provided on an upper surface and/or a lower surface of the left longitudinal support bar or the right longitudinal support bar.

According to a further embodiment of the invention, each of the brackets is mounted on a corresponding sliding sleeve and is provided with a pivot shaft located on both lateral sides of the sliding sleeve and extending in a vertical direction, wherein the connecting rod is pivotally connected to the bracket via the pivot shaft.

According to a further embodiment of the invention, the bracket comprises an upper board mounted on an upwardly facing surface of the sliding sleeve and a lower board fixedly mounted on a downwardly facing surface of the sliding sleeve, either of the lateral sides of the upper board and lower board extends out of the sliding sleeve to form a cantilever, wherein the pivot shafts are connected between the cantilevers formed on the same side of the upper board and lower plate.

According to a further embodiment of the invention, the upper board comprises two horizontal meshing plates which are respectively connected to two pivot shafts located on the lateral sides of the sliding sleeve, the meshing plates are in a sector shape and formed with a gear structure at an acute edge thereof, the gear structures of the two upper plates which are connected to one of the sliding sleeves face each other and can mesh with each other, thereby enabling synchronous rotation of the two connecting rods connected to the sliding sleeve.

According to a further embodiment of the invention, an end of the connecting rod that is connected to the sliding sleeve has an upper side plate and a lower side plate which extend in the horizontal direction and face each other, wherein the pivot shaft is located between the upper side plate and the lower side plate, and

the bracket includes a bearing frame and a retaining plate, wherein the bearing frame is fixedly mounted on a lower side of the sliding sleeve and extends laterally relative to the sliding sleeve so that it can be supported below the lower side plate, and the retaining plate is positioned above the lower side plate in order to provide a position limitation for the end of the connecting rod connected to the sliding sleeve in the vertical direction.

According to a further embodiment of the invention, the upper side plate is formed into a partially circular shape, at the edge of which a gear structure is formed, wherein a rack extending in the longitudinal direction is disposed on both lateral upper edges of the sliding sleeve respectively, the gear structures of two connecting rods connected to one sliding sleeve can respectively mesh with corresponding racks so that the two connecting rods connected to the sliding sleeve can rotate synchronously.

According to a further embodiment of the invention, the left longitudinal support bar, the right longitudinal support bar and the intermediate longitudinal support bar respectively comprise two main body sections and an intermediate section connected between the two main body sections, the main body sections and the intermediate section are connected via a connecting sheet, a support bar pivot shaft is mounted on the connecting sheet, the two main body sections are configured to be capable of rotating relative to each other about their respective support bar pivot shafts in a vertical plane relative to the intermediate section so that the bed frame is collapsed or deployed in the vertical plane.

According to a further embodiment of the invention, the bed frame further comprises a locking mechanism for locking the main body sections relative to the intermediate section when the main body sections rotate to the collapsed or deployed position in the vertical plane.

According to a further embodiment of the invention, the connecting rod comprises a plurality of bushings which are nested one inside another so that the connecting rod is telescopic in its extension direction.

According to a further embodiment of the invention, in any two adjacent bushings, one bushing is provided with a first alignment hole, a ball end leaf spring with a protrusion is disposed in the first alignment hole, the ball end leaf spring is configured to extend out of the first alignment hole under action of an elastic force and retract back into the first alignment hole when subjected to a pressure, the other bushing is nested around a preceding bushing, a second alignment hole is disposed on a side face of the other bushing facing the first alignment hole, the second alignment hole is configured in a way that when the second alignment hole aligns with the protrusion, the protrusion can extend out under the action of elasticity, automatically enter the second alignment hole and thereby lock the two adjacent bushings relative to one another.

According to a further embodiment of the invention, the bed frame is configured to be engageable with a tongue member for mounting a bedhead member, the tongue member comprises a tongue, an upwardly open slot is provided at the end of the left longitudinal support bar and right longitudinal support bar, and the slot is configured to receive the tongue.

According to a further embodiment of the invention, the left longitudinal support bar, the right longitudinal support bar, and the intermediate longitudinal support bar are respectively provided with downwardly extending legs at both ends and in the middle.

In one embodiment, the legs are also pivotally connected to respective longitudinal support bars, the legs are rotatable and foldable relative to the respective longitudinal support bars, and in the collapsed state the legs abut against the respective longitudinal support bars side by side.

A further aspect of the present disclosure provides a bed frame, comprising:

a left longitudinal support bar and a right longitudinal support bar which are located on both lateral sides of the bed frame respectively and extend in a longitudinal direction of the bed frame;

two spaced-apart sliding sleeves slidably disposed on the intermediate longitudinal support bar, wherein each of the sliding sleeve is provided with a bracket; and

four connecting rods comprising two left connecting rods extending between the left longitudinal support bar and the intermediate longitudinal support bar and two right connecting rods extending between the right longitudinal support bar and the intermediate longitudinal support bar, wherein one end of each of the connecting rods is pivotally attached to an end of the left longitudinal support bar or the right longitudinal support bar, and the other end of the connecting rod is pivotally attached to a corresponding bracket,

wherein each of the connecting rod is configured so that its end mounted on the bracket moves along with the sliding sleeve when the sliding sleeve slides along the intermediate longitudinal support bar, thereby driving the connecting rod to move on a horizontal plane, as a result of which the bed frame is in a deployed state or a collapsed state; and

wherein the bed frame further comprises at least two additional links extending between the intermediate longitudinal support bar and the connecting rods, one end of each of the additional links is pivotally connected to one end of the intermediate longitudinal support bar, the other end is pivotally connected to the connecting rod, and when the connecting rod moves in a horizontal plane, the additional link can be driven by the connecting rod to move in a horizontal plane.

According to a further embodiment of the invention, the additional links comprise two additional links, and the two additional links are located on the same side relative to the intermediate longitudinal support bar; or

the additional links comprise two additional links, and the two additional links are located on different sides relative to the intermediate longitudinal support bar.

According to a further embodiment of the invention, the additional links comprise two additional links, and the two additional links are located on different sides relative to the intermediate longitudinal support bar, and one ends of the two additional links are respectively connected to opposing ends of the intermediate longitudinal support bar.

According to a further embodiment of the invention, the additional links comprise four additional links.

According to a further embodiment of the invention, the intermediate longitudinal support bar is disposed with pin holes at positions close to its end portions and middle portion respectively, and a pin is disposed in each of the pin holes, and the pin is configured to extend out of the pin hole under the action of an elastic force and retract back into the pin hole when being subject to a pressure.

According to a further embodiment of the invention, a receiving hole is disposed on a side of the sliding sleeve facing the pin hole, wherein the receiving hole is configured to allow the pin to extend out under the action of its elasticity when the receiving hole is aligned with the pin, and automatically enter the receiving hole to lock the sliding sleeve on the intermediate longitudinal support bar.

According to a further embodiment of the invention, the pin holes are provided on an upper surface and/or a lower surface of the intermediate longitudinal support bar.

According to a further embodiment of the invention, each of the brackets is mounted on a corresponding sliding sleeve, and each of the brackets is provided with a pivot shaft located on both lateral sides of the sliding sleeve and extending in a vertical direction, and the connecting rod is pivotally connected to the bracket via the pivot shaft.

According to a further embodiment of the invention, the bracket comprises an upper board mounted on an upwardly facing surface of the sliding sleeve and a lower board fixedly mounted on a downwardly facing surface of the sliding sleeve, both lateral sides of the upper board and lower board respectively extend out of the sliding sleeve to form cantilevers, and the pivot shafts are connected between the cantilevers on the same side of the upper board and lower plate.

According to a further embodiment of the invention, the upper board comprises two horizontal meshing plates which are respectively connected to two pivot shafts located on both lateral sides of the sliding sleeve, the meshing plates are in a sector shape and provided with a gear structure at an arcuate edge thereof, the gear structures of the two upper plates connected to one sliding sleeve face each other and can mesh with each other, thereby enabling synchronous rotation of the two connecting rods connected to the sliding sleeve.

According to a further embodiment, an end of the connecting rod connected to the sliding sleeve has an upper side plate and a lower side plate which extend in the horizontal direction and face each other, and the pivot shaft is located between the upper side plate and the lower side plate, and

the bracket includes a bearing frame and a retaining plate, the bearing frame is fixedly mounted on a lower side of the sliding sleeve and extending laterally relative to the sliding sleeve to be supported below the lower side plate, and the retaining plate is positioned above the lower side plate in order to achieve position limitation of the end of the connecting rod connected to the sliding sleeve in the vertical direction.

A further aspect of the present disclosure provides a bed frame, comprising:

wherein each of the connecting rods is configured so that its end mounted on the bracket moves along with the sliding sleeve when the sliding sleeve slides along the left longitudinal support bar or right longitudinal support bar, thereby driving the connecting rod to move on a horizontal plane, as a result of which the bed frame is in an deployed state or a collapsed state; and

wherein the bed frame further comprises at least two additional links extending between the left longitudinal support bar and the connecting rods or between the right longitudinal support bar and the connecting rods, one end of each of the additional links is pivotally connected to one end of the left longitudinal support bar or the right longitudinal support bar, the other end is pivotally connected to the connecting rod, and when the connecting rod moves in a horizontal plane, the additional link can be driven by the connecting rod to move in a horizontal plane.

According to a further embodiment of the invention, the additional links comprise four additional links

According to a further embodiment of the invention, the left longitudinal support bar or right longitudinal support bar is disposed with pin holes at positions close to its end portions and middle portion respectively and at a transition position between the end portions and the middle portion, respectively, and a pin is disposed in each of the pin holes, and the pin is configured to extend out of the pin hole under the action of an elastic force and retract back into the pin hole when being subject to a pressure.

According to a further embodiment of the invention, a receiving hole is disposed on a side of the sliding sleeve facing the pin hole, wherein the receiving hole is configured to allow the pin to extend out under the action of its elasticity when the receiving hole is aligned with the pin, and automatically enter the receiving hole to lock the sliding sleeve on the left longitudinal support bar or right longitudinal support bar.

According to a further embodiment of the invention, an end of the connecting rod connected to the sliding sleeve has an upper side plate and a lower side plate which extend in the horizontal direction and face each other, and the pivot shaft is located between the upper side plate and the lower side plate, and

In the bed frame provided by the present disclosure, the support bars for bearing weight are connected via the connecting rods, the connecting rods are driven to move by enabling an end of the connecting rods to slide on the support bars, thereby achieving the unfolding or folding of the bed frame. Such arrangement can enable quick and effective folding of the bed frame. The space occupied by the collapsed bed frame is small. The folding process is relatively simple and easy to implement. Furthermore, the bed frame exhibits better strength and stability. In either the deployed state or collapsed state, the bed frame can bear a larger weight and can satisfy many demands of the user.

BRIEF DESCRIPTION OF DRAWINGS

Reference may be made to preferred embodiments shown in the figures to enable better understanding of the above and other objects, features, advantages and functions of the present disclosure. The same reference numerals in the figures denote the same parts. Those skilled in the art should appreciate that the figures are intended to schematically illustrate the preferred embodiments of the present disclosure, and not intended to impose any limitations to the scope of the present disclosure. All parts in the figures are not drawn to scale.

FIG.1 is a schematic view of a bed frame according to a first embodiment of the present disclosure, wherein the bed frame is in a semi-unfolded state;

FIG.2 is another schematic view of the bed frame, wherein the bed frame is in an deployed state;

FIG.3 is a further schematic view of the bed frame, wherein the bed frame is in a collapsed state;

FIG.4 is a schematic view of a sliding sleeve of the bed frame;

FIG.5-FIG.7 are schematic views of several alternative embodiments of the sliding sleeve of the bed frame;

FIG.8 is a partial enlarged view ofFIG.3;

FIG.9 is a schematic view of a semi-folded state of the bed frame in a vertical plane;

FIG.10 is a schematic view of a collapsed state of the bed frame in a vertical plane;

FIG.11 andFIG.12 are two other schematic views of the bed frame, wherein the connecting rods are telescope along its extension direction;

FIG.13 is a schematic view of the bed frame and the tongue member;

FIG.14 is a schematic view of a bed frame according to a second embodiment of the present disclosure, wherein the bed frame is in a semi-unfolded state;

FIG.15 is a schematic view of a bed frame of a third embodiment of the present disclosure;

FIG.16 throughFIG.18 are several alternative structures ofFIG.15.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Specific embodiments of the present disclosure will now be described in detail with reference to the figures. Those skilled in the art can implement other manners of the present disclosure on the basis of the preferred embodiments, and other manners also fall within the scope of the present disclosure.

Referring toFIG.1 throughFIG.13, a bed frame is provided in a first embodiment of the present disclosure.

Referring toFIG.1 throughFIG.3, it can be seen that the bed frame includes a leftlongitudinal support bar1, a rightlongitudinal support bar2 and an intermediatelongitudinal support bar3 therebetween which are highly rigid and used to bear a weight. The three longitudinal support bars each extend in a longitudinal direction, and the three longitudinal support bars are each provided withlegs8 located at both ends and in the middle and extending downward. At the same time, the intermediatelongitudinal support bar3 is provided with two slidingsleeves4 spaced apart from each other a certain distance and being capable of sliding on the intermediatelongitudinal support bar3, and the slidingsleeves4 are mounted with brackets.

It should be appreciated that extension directions of the various components mentioned in the present disclosure (for example, “a transverse direction”, “a longitudinal direction” and “a vertical direction”) all refer to the extensions directions of the components in the case that the bed frame is placed in a horizontal plane, so directional terms mentioned in the text should be understood to be relative terms rather than absolute terms. Furthermore, it can be understood that both “transverse direction” and “longitudinal direction” are horizontal directions, and they together define a horizontal plane, and the vertical direction is a direction perpendicular to the horizontal plane.

Further referring toFIG.1 throughFIG.3, connectingrods5 are further connected between the leftlongitudinal support bar1 or the rightlongitudinal support bar2 and the intermediatelongitudinal support bar3, there are totally fourconnecting rods5, one end of each connectingrod5 is pivotally attached to an end of the leftlongitudinal support bar1 or rightlongitudinal support bar2 about a pivot shaft, and the other end of the connecting rod is pivotally attached to a corresponding bracket about a pivot shaft. As such, when the slidingsleeve4 slides along the intermediatelongitudinal support bar3, the end of the connectingrod5 connected to the corresponding bracket moves along with the slidingsleeve4, thereby driving the connectingrod5 to move in a horizontal plane and thereby transversely unfolding or folding the bed frame.

Specifically, when the two slidingsleeves4 slide toward each other along the intermediatelongitudinal support bar3, the bed frame is gradually collapsed until it gets into a collapsed state in which the leftlongitudinal support bar1, the rightlongitudinal support bar2 and the intermediatelongitudinal support bar3 abut against one another side by side, the collapsed state being shown byFIG.3; when the slidingsleeves4 slide away from each other along the intermediatelongitudinal support bar3, the bed frame is gradually deployed until the bed frame gets into an deployed state in which the respective connectingrods5 are perpendicular to respective longitudinal support bars respectively, the deployed state being shown byFIG.2.

In order to fix the slidingsleeve4 on the intermediatelongitudinal support bar3 and thereby fix the connectingrods5, a pin hole is provided on a surface of the intermediatelongitudinal support bar3, an elastic pin is disposed in the pin hole, the pin is configured to extend out of the pin hole under the action of an elastic force and retract back into the pin hole when subjected to a pressure, a surface of the slidingsleeve4 corresponding to the pin hole is provided with a receivinghole41, and the pin and the receivinghole41 can engage with each other to lock the slidingsleeve4. Specifically, the pin hole includes end pin holes and a middle pin hole which respectively receive end pins and a middle pin, and the end pin holes and the middle pin hole are respectively located at the intermediatelongitudinal support bar3 close to its end positions and close to a middle position.

Wherein, the end pin is used to engage with the receivinghole41 to fix the connectingrod5 perpendicular to the longitudinal support bar. When the end pin engages with the receivinghole41, the connectingrod5 extends transversely, and the bed frame is in the deployed state as stated above; the middle pin is used to engage with the receivinghole41 to fix the connectingrod5 parallel to the longitudinal support bar, and when the middle pin engages with the receivinghole41, the bed frame is in the collapsed state as described above.

Preferably, an intermediate pin hole may be provided at an intermediate position between the end pin hole and the middle pin hole to fix the bed frame in a semi-unfolded state, which may be similar to that shown inFIG.1. On the intermediatelongitudinal support bar3, a distance between the two middle pin holes may be ⅕-⅓ of the length of the intermediatelongitudinal support bar3, for example ¼. Each of the examples shown inFIGS.4 to7 may be understood to mean that the intermediate pin engages with the receivinghole41 to fix the bed frame in the semi-unfolded state, whereupon an angle between the connecting rods and the intermediate longitudinal support bar is an acute angle so that the bed frame is formed as a twin size bed frame.

More preferably, more pin holes and pins at multiple different positions may be disposed so that the angle between the connectingrods5 and respective longitudinal support bars gradually changes such that the bed frame can be fixed at different positions to change more sizes. For example, when the bed frame is completely folded in the horizontal plane, it is formed as a single size bed frame; when the bed frame is semi-unfolded in the horizontal plane, it is formed as a twin size bed frame; next, the bed frame may be further unfolded again for many times such that the bed frame is formed as a full size bed frame, a queen size bed frame, a king size bed frame, a California king size bed frame or the like.

Preferably, the pin may be a round pin61 (as shown inFIGS.4,5 and7) or a square pin62 (as shown inFIG.6) which may be disposed on an upper surface and/or lower surface of the intermediatelongitudinal support bar3. More preferably, as shown inFIG.7, the slidingsleeve4 may further be provided with a plurality of receivingholes41 arranged in the longitudinal direction, and each of the receiving holes41 can engage with the pin to lock the slidingsleeve4 at different positions of the intermediatelongitudinal support bar3.

The arrangement of the connection of the connectingrod5 to the slidingsleeve4 may have various implementation modes, and several examples are shown inFIG.4 toFIG.7. In several modes, the slidingsleeve4 is mounted with a bracket, and the bracket is provided with apivot shaft725 positioned on both lateral sides of the slidingsleeve4 and extending in a vertical direction, and the connectingrod5 is connected to the bracket via thepivot shaft725.

In the solution shown inFIG.4, the bracket includes anupper board711 mounted on a upward facing surface of the slidingsleeve4 and alower board712 fixedly mounted on a downward facing surface of the slidingsleeve4, both lateral sides of theupper board711 andlower board712 respectively extend out of the slidingsleeve4 to form cantilevers, and thepivot shaft725 is connected between the cantilevers on the same side of theupper board711 andlower board712.

FIG.5 andFIG.6 show variations of the solution shown inFIG.4. InFIG.5 andFIG.6, theupper board711 includes twohorizontal meshing plates52 which are respectively connected to twopivot shafts725 located on both lateral sides of the slidingsleeve4, and the meshingplates52 are rotatable relative to the slidingsleeve4 in a horizontal plane. The meshingplates52 are in a sector shape and provided with agear structure521 on an arcuate edge thereof. The twogear structures521 connected to one slidingsleeve4 face each other and can mesh with each other, thereby enabling synchronous rotation of the two connectingrods5 connected to the same slidingsleeve4 when the slidingsleeve4 slides. The solutions ofFIG.5 andFIG.6 are substantially similar, but it can be seen that the locking of the slidingsleeve4 is achieved via theround pin61 disposed on the upper surface of the support bar and the receivinghole41 corresponding thereto inFIG.5, and the locking of the slidingsleeve4 is achieved via thesquare pin62 disposed on the lower surface of the support bar and the receiving hole corresponding thereto inFIG.6.

Then turning toFIG.7,FIG.7 shows a further variation ofFIG.4. An end of the connectingrod5 connected to the slidingsleeve4 has anupper side plate721 and alower side plate723 which extend in the horizontal direction and face each other, and theupper side plate721 and thelower side plate723 are connected by a vertical connectingportion722. Thepivot shaft725 is located between theupper side plate721 and thelower side plate723. Furthermore, the bracket includes abearing frame715 and a retainingplate724, thebearing frame715 is fixedly mounted on the lower side of the slidingsleeve4 and extending laterally relative to the slidingsleeve4 to support thelower side plate723 below thelower side plate723, and the retainingplate724 is positioned above thelower side plate723 to achieve limitation of the end of the connectingrod5 connected to the slidingsleeve4 in the vertical direction.

Further referring toFIG.7, theupper side plate721 is formed as a substantially circular shape, an edge of the circular shape is formed as agear structure521, arack42 extending in the longitudinal direction is disposed on both lateral upper edges of the slidingsleeve4 respectively, thegear structures521 of two connectingrods5 connected to a slidingsleeve4 can respectively mesh with correspondingracks42 so that the two connectingrods5 connected to the slidingsleeve4 can rotate synchronously when the slidingsleeve4 slides.

Preferably, the bed frame may further be configured to be folded in a vertical plane to further reduce the space occupied by the bed frame in its collapsed state. Now turning toFIG.8 toFIG.10, it can be seen that each of the three support bars comprises three portions: two main body sections (i.e., a firstmain body section11 and a second main body section13) and anintermediate section12 connected between the two main body sections. A connectingsheet14 is disposed at a connecting position of the main body sections and theintermediate section12, a supportbar pivot shaft15 is mounted on the connectingsheet14, the two main body sections are capable of rotating relative to each other about their respective supportbar pivot shafts15 in the vertical plane relative to theintermediate section12 so that the bed frame is collapsed or deployed in the vertical plane.FIG.9 throughFIG.10 show a process in which the bed frame is gradually collapsed. Arrows inFIG.9 show movement directions of the main body sections.

More preferably, a length of theintermediate section12 may be set equal to that of theleg8, so that after the bed frame is folded in the vertical plane, the bed frame may be formed into a relatively standard rectangle in the vertical plane, as shown inFIG.10. This can facilitate the storage of the bed frame, reduce the occupied space, and is visually more beautiful.

On the other hand, in order to further adjust the size of the bed frame in the transverse direction, the connectingrod5 may be arranged to include at least two bushings which are nested one inside the other so that the connectingrod5 is telescopic in its extension direction. When the bed frame is already in the deployed state, the size of the bed frame as a whole in the transverse direction can be further adjusted by adjusting the size of an overlapping portion between adjacent bushings.

For example, in the bed frame ofFIG.11, each of the connectingrods5 includes two bushings—afirst bushing51 and asecond bushing52, whereas in the bed frame inFIG.12, each of the connectingrods5 further comprises athird bushing53. Preferably, the fixation between adjacent bushings may be achieved by providing a ballend leaf spring53 between the bushings. For the two adjacent bushings, one bushing is provided with a first alignment hole, and an elastic ball endleaf spring53 with aprotrusion53 is disposed in the first alignment hole, the ball endleaf spring53 can allow theprotrusion531 to extend out of the first alignment hole under action of an elastic force, and allow theprotrusion531 to retract when compressed. The other bushing is nested around a preceding bushing, a second alignment hole is disposed on the second bushing, and when the second alignment hole aligns with the first alignment hole, theprotrusion531 extends into the second alignment hole under the action of the elasticity of the ball endleaf spring53, thereby locking the two bushings.

Preferably, the bed frame is also engageable with atongue member9 for mounting a bedhead member, thetongue member9 comprises atongue91, an upwardlyopen slot16 is further provided at the end of the leftlongitudinal support bar1 and rightlongitudinal support bar2, and thetongue91 can be inserted into theslot16.

At the same time, in other embodiments not shown, the bed frame may also have other arrangements. For example, it is also possible to arrange thelegs8 below the longitudinal support bars to be foldable, for example to pivotally connect thelegs8 to the longitudinal support bars, thelegs8 being capable of abutting against the respective longitudinal support bars when thelegs8 are folded.

FIG.14 shows a second embodiment of the disclosure.

In the present embodiment, two slidingsleeves4 are disposed spaced apart on both the leftlongitudinal support bar1 and rightlongitudinal support bar2, and the slidingsleeves4 are slideable on the longitudinal support bars. Therefore, in the present embodiment, there are a total of four slidingsleeves4, and the slidingsleeves4 each are provided with a bracket.

There are still a total of four connectingrods5, one end of each connectingrod5 is pivotally attached to the end of the intermediatelongitudinal support bar3 about a pivot shaft, and the other end of the connectingrod5 is pivotally attached to a corresponding bracket about a pivot shaft.

Wherein, when the slidingsleeve4 slides along the corresponding longitudinal support bar, one end of the slidingsleeve4 mounted on the bracket moves along with the slidingsleeve4, thereby driving the connectingrod5 to rotate in a horizontal plane, and thereby causing the bed frame to be in a deployed state or collapsed state.

Other configurations and arrangements of the present embodiment are similar to those of the previous embodiment, and are not described any longer herein for the sake of simplicity.

FIG.15 throughFIG.18 show a third embodiment of the present disclosure. The basic structure of the bed frame in the present embodiment is similar to that of the first embodiment described above. In the present embodiment, the bed frame further includes anadditional link56 extending between the intermediatelongitudinal support bar3 and the connecting rod, one end of eachadditional link56 is pivotally connected to one end of the intermediatelongitudinal support bar3, the other end of theadditional link56 is pivotally connected to its corresponding connecting rod. And when the connecting rod is driven by the slidingsleeve4 to move in a horizontal plane, theadditional link56 can be driven by the connecting rod to move in a horizontal plane.

In the solutions shown inFIG.15 andFIG.16, there are twoadditional links56 which are located on the same side relative to the intermediatelongitudinal support bar3. InFIG.15, the twoadditional links56 are respectively connected to two right connecting rods55 (i.e., connecting rods between the rightlongitudinal support bar2 and the intermediate longitudinal support bar3); inFIG.16, the twoadditional links56 are respectively connected to two left connecting rods54 (i.e., connecting rods between the leftlongitudinal support bar1 and the intermediate longitudinal support bar3).

In the solution shown inFIG.17, there are twoadditional links56 which are located on different sides relative to the intermediatelongitudinal support bar3, and the twoadditional links56 are respectively connected to the opposed ends of the intermediatelongitudinal support bar3. It can be seen fromFIG.17, the twoadditional links56 are located on both lateral sides of the bed frame, one is connected to theleft connecting rod54, and the other is connected to theright connecting rod55.

In another solution, there may be fouradditional links56 which are connected one to one with the four connecting rods.FIG.18 shows the structure at one transverse end of the bed frame in this solution, and twoadditional links56 are connected to theleft connecting rod54 and theright connecting rod55, respectively. It may be understood that the structure at the other transverse end of the bed frame is substantially similar to the structure shown inFIG.18.

In other embodiments not shown, it is also possible to additionally provide additional links on the basis of the bed frame of the second embodiment. Specifically, the bed frame may further comprise at least two additional links extending between the left longitudinal support bar and the connecting rod or between the right longitudinal support bar and the connecting rod, one end of each additional link is pivotally attached to one end of the left longitudinal support bar or right longitudinal support bar, the other end is pivotally connected to the connecting rod, and, the additional links can be driven to move in the horizontal plane when the connecting rod moves in the horizontal plane.

The additional links may also be arranged in many ways. For example, there are two additional links, and the two additional links are located on the same side relative to the intermediate longitudinal support bar; or the two additional links are located on different sides relative to the intermediate longitudinal support bar.

Preferably, the two additional links are located on different sides relative to the intermediate longitudinal support bar, and one end of each of the two additional links is connected to an opposed end of the intermediate longitudinal support bar.

Or, there are four additional links which may be connected one to one with the four connecting rods.

The provision of the additional links can reinforce the strength of the bed frame; especially when the bed frame is in a semi-unfolded state, the additional links can function to assist in supporting. Moreover, the provision of the additional links can also enable more firm and stable connection between the intermediate longitudinal support bar and the left longitudinal support bar and the right longitudinal support bar.

In the bed frame provided by the present disclosure, the support bars for bearing weight are connected via the connecting rods, the connecting rods are driven to move by enabling an end of the connecting rods to slide on the support bars, thereby achieving the unfolding or folding of the bed frame. Such arrangement can enable quick and effective folding of the bed frame. The space occupied by the folded bed frame is small. The folding process is relatively simple and easy to implement. Furthermore, the bed frame exhibits better strength and stability. In either the deployed state or collapsed state, the bed frame can bear a larger weight and can satisfy many demands of the user.

LISTING OF PARTS DESIGNATED BY REFERENCE NUMBERS

- Leftlongitudinal support bar1
- Rightlongitudinal support bar2
- Intermediatelongitudinal support bar3
- Slidingsleeve4
- Connecting rod5
- Firstmain body section11
- Secondmain body section13
- Intermediate section12
- Connectingsheet14
- Supportbar pivot shaft15
- Slot16
- Leg8
- Receivinghole41
- Rack42
- Meshing plate52
- Gear structure521
- Ballend leaf spring53
- Protrusion531
- Round pin61
- Square pin62
- Upper plate711
- Lower plate712
- Pivot shat725
- Bearing frame715
- Retainingplate724
- Upper side plate721
- Lower side plate723
- Connectingportion722
- First bushing51
- Second bushing52
- Third bushing53
- Tongue member9
- Tongue91
- Left connectingrod54
- Right connectingrod55
- Additional link56

Additional Embodiments

The following are additional embodiments, beginning with embodiment No. 21 as listed below:

21. A bed frame, comprising:

wherein the bed frame further comprises:

four connecting rods comprising two left connecting rods extending between the left longitudinal support bar and the intermediate longitudinal support bar and two right connecting rods extending between the right longitudinal support bar and the intermediate longitudinal support bar, wherein one end of each of the connecting rods is pivotally attached to an end of the intermediate longitudinal support bar about a pivot shaft, and the other end of the connecting rod is pivotally attached to the corresponding bracket,

wherein the connecting rod is configured in a way that the end of the connecting rod mounted on the bracket moves along with the sliding sleeve when the sliding sleeve slides along the left longitudinal support bar or right longitudinal support bar, thereby driving the connecting rod to move on a horizontal plane such that the bed frame is in an unfolded state or a folded state.

23. The bed frame according to claim21, wherein a pin hole is disposed on the left longitudinal support bar or right longitudinal support bar at positions close to its end portions and middle portion, respectively, a pin is disposed in the pin hole, and the pin is configured to extend out of the pin holes under the action of an elastic force and retract back into the pin holes when subjected to pressure.

24. The bed frame according to claim23, wherein a pin hole is also disposed on a middle position between the end portions and the middle portion, a pin is disposed in the pin hole, and the pin is configured to extend out of the pin holes under the action of an elastic force and retract back into the pin holes when subjected to pressure.

25. The bed frame according to claim24, wherein a receiving hole is disposed on a side of the sliding sleeve facing the pin hole, wherein the receiving hole is configured in a way that when the receiving hole is aligned with the pin, the pin can extend out under the action of its elasticity, and automatically enter the receiving hole to lock the sliding sleeve on the corresponding left longitudinal support bar or right longitudinal support bar.

27. The bed frame according to claim23, wherein the pin is a square pin or a round pin.

28. The bed frame according to claim23, wherein the pin holes are provided on an upper surface and/or a lower surface of the left longitudinal support bar or the right longitudinal support bar.

29. The bed frame according to claim21, wherein the bracket is mounted on the sliding sleeve, and the bracket is provided with a pivot shaft located on both lateral sides of the sliding sleeve and extending in a vertical direction, and the connecting rod is pivotally connected to the bracket via the pivot shaft.

30. The bed frame according to claim29, wherein the bracket comprises an upper plate mounted on an upwardly facing surface of the sliding sleeve and a lower plate fixedly mounted on a downwardly facing surface of the sliding sleeve, both lateral sides of the upper plate and lower plate respectively extend out of the sliding sleeve to form cantilevers, and the pivot shafts are connected between the cantilevers on the same side of the upper plate and lower plate.

31. The bed frame according to claim30, wherein the upper plate comprises two horizontal meshing plates which are respectively connected to two pivot shafts located on both lateral sides of the sliding sleeve, the meshing plates are in a sector shape and provided with a gear structure on an arcuate edge thereof, the gear structures of the two upper plates connected to one sliding sleeve face each other and can mesh with each other, thereby enabling synchronous rotation of the two connecting rods connected to the sliding sleeve.

32. The bed frame according to claim29, wherein an end of the connecting rod connected to the sliding sleeve has an upper side plate and a lower side plate which extend in the horizontal direction and face each other, and the pivot shaft is located between the upper side plate and the lower side plate, and

the bracket includes a bearing frame and a retaining plate, the bearing frame is fixedly mounted on a lower side of the sliding sleeve and extending laterally relative to the sliding sleeve to be supported below the lower side plate, and the retaining plate is positioned above the lower side plate to achieve limitation of the end of the connecting rod connected to the sliding sleeve in the vertical direction.

33. The bed frame according to claim32, wherein the upper side plate is formed as a partially circular shape, an edge of the circular shape is formed as a gear structure, a rack extending in the longitudinal direction is disposed on both lateral upper edges of the sliding sleeve respectively, the gear structures of two connecting rods connected to one sliding sleeve can respectively mesh with respective racks so that the two connecting rods connected to the sliding sleeve can rotate synchronously.

34. The bed frame according to claim21, wherein the left longitudinal support bar, the right longitudinal support bar and the intermediate longitudinal support bar respectively comprise two main body sections and an intermediate section connected between the two main body sections, the main body sections and the intermediate section are connected via a connecting sheet, a support bar pivot shaft is mounted on the connecting sheet, the two main body sections are configured to be capable of rotating relative to each other about their respective support bar pivot shafts in a vertical plane relative to the intermediate section so that the bed frame is folded or unfolded in the vertical plane.

35. The bed frame according to claim34, wherein the bed frame further comprises a locking mechanism for locking the main body sections relative to the intermediate section when the main body sections rotate to the folded or unfolded position in the vertical plane.

36. The bed frame according to claim21, wherein the connecting rod comprises a plurality of bushing rods which are nested one inside another so that the connecting rod is telescopic in its extension direction.

37. The bed frame according to claim36, wherein in any two adjacent bushing rods, one bushing rod is provided with a first alignment hole, a ball end leaf spring with a protrusion is disposed in the first alignment hole, the ball end leaf spring is configured to extend out of the first alignment hole under action of an elastic force and retract back into the first alignment hole when subjected to a pressure, the other bushing rod is nested around a preceding bushing rod, a second alignment hole is disposed on a side face of the other bushing rod facing the first alignment hole, the second alignment hole is configured in a way that when the second alignment hole aligns with the protrusion, the protrusion can extend out under the action of elasticity, automatically enter the second alignment hole and thereby lock the two adjacent bushing rods relative to one another.

38. The bed frame according to claim21, wherein the bed frame is configured to be engageable with a tongue member for mounting a bedhead member, the tongue member comprises a tongue, an upwardly open slot is provided at the end of the left longitudinal support bar and right longitudinal support bar, and the slot is configured to receive the tongue.

39. The bed frame according to claim21, wherein the left longitudinal support bar, the right longitudinal support bar, and the intermediate longitudinal support bar are respectively provided with downwardly extending legs at both ends and in the middle.

40. The bed frame according to claim39, wherein the legs are also pivotally connected to respective longitudinal support bars, the legs are rotatable and foldable relative to the respective longitudinal support bars, and in the folded state the legs abut against the respective longitudinal support bars side by side.

41. A bed frame, comprising:

wherein the bed frame further comprises:

two spaced-apart sliding sleeves disposed on the intermediate longitudinal support bar and being slidable on the intermediate longitudinal support bar, wherein a bracket is disposed on the sliding sleeve; and

four connecting rods comprising two left connecting rods extending between the left longitudinal support bar and the intermediate longitudinal support bar and two right connecting rods extending between the right longitudinal support bar and the intermediate longitudinal support bar, wherein one end of each of the connecting rods is pivotally attached to an end of the left longitudinal support bar or the right longitudinal support bar, and the other end of the connecting rod is pivotally attached to the corresponding bracket,

wherein the connecting rod is configured in a way that the end of the connecting rod mounted on the bracket moves along with the sliding sleeve when the sliding sleeve slides along the intermediate longitudinal support bar, thereby driving the connecting rod to move on a horizontal plane such that the bed frame is in an unfolded state or a folded state; and

42. The bed frame according toclaim41, wherein

the additional links comprise two additional links, and the two additional links are located on the same side relative to the intermediate longitudinal support bar; or

43. The bed frame according toclaim42, wherein the additional links comprise two additional links, and the two additional links are located on different sides relative to the intermediate longitudinal support bar, and one ends of the two additional links are respectively connected to opposing ends of the intermediate longitudinal support bar.

44. The bed frame according toclaim41, wherein the additional links comprise four additional links

46. The bed frame according toclaim41, wherein the intermediate longitudinal support bar is provided with a pin hole at positions close to its end portions and middle portion respectively, a pin is disposed in the pin hole, and the pin is configured to extend out of the pin hole under the action of an elastic force and retract back into the pin hole when subjected to pressure.

47. The bed frame according to claim44, wherein a pin hole is also disposed on a middle position between the end portions and the middle portion, a pin is disposed in the pin hole, and the pin is configured to extend out of the pin holes under the action of an elastic force and retract back into the pin holes when subjected to pressure.

48. The bed frame according to claim45, wherein a receiving hole is disposed on a side of the sliding sleeve facing the pin hole, wherein the receiving hole is configured in a way that when the receiving hole is aligned with the pin, the pin can extend out under the action of its elasticity, and automatically enter the receiving hole to lock the sliding sleeve on the intermediate longitudinal support bar.

49. The bed frame according to claim46, wherein the pin holes at the end portions of the intermediate longitudinal support bar are positioned in a way that the connecting rods are perpendicular to the intermediate longitudinal support bar when the connecting rods are locked on the intermediate longitudinal support bar; the pin hole at the middle portion of the intermediate longitudinal support bar is positioned in a way that when the connecting rods are locked, the connecting rods and the intermediate longitudinal support bar abut against one another side by side; the pin hole at the middle position of the intermediate longitudinal support rod is positioned in a way that when the connecting rods are locked, an angle between the connecting rods and the intermediate longitudinal support bar is an acute angle so that a width of the bed frame is adapted for dimension requirements of a twin size bed.

50. The bed frame according to claim46, wherein the pin is a square pin or a round pin.

51. The bed frame according to claim46, wherein the pin holes are provided on an upper surface and/or a lower surface of the intermediate longitudinal support bar.

52. The bed frame according toclaim41, wherein the bracket is mounted on the sliding sleeve, and the bracket is provided with a pivot shaft located on both lateral sides of the sliding sleeve and extending in a vertical direction, and the connecting rod is pivotally connected to the bracket via the pivot shaft.

53. The bed frame according to claim50, wherein the bracket comprises an upper plate mounted on an upwardly facing surface of the sliding sleeve and a lower plate fixedly mounted on a downwardly facing surface of the sliding sleeve, both lateral sides of the upper plate and lower plate respectively extend out of the sliding sleeve to form cantilevers, and the pivot shafts are connected between the cantilevers on the same side of the upper plate and lower plate.

54. The bed frame according toclaim51, wherein the upper plate comprises two horizontal meshing plates which are respectively connected to two pivot shafts located on both lateral sides of the sliding sleeve, the meshing plates are in a sector shape and provided with a gear structure on an arcuate edge thereof, the gear structures of the two upper plates connected to one sliding sleeve face each other and can mesh with each other, thereby enabling synchronous rotation of the two connecting rods.

55. The bed frame according toclaim52, wherein an end of the connecting rod connected to the sliding sleeve has an upper side plate and a lower side plate which extend in the horizontal direction and face each other, and the pivot shaft is located between the upper side plate and the lower side plate, and

56. The bed frame according toclaim53, wherein the upper side plate is formed as a partially circular shape, an edge of the circular shape is formed as a gear structure, a rack extending in the longitudinal direction is disposed on both lateral upper edges of the sliding sleeve respectively, the gear structures of two connecting rods connected to one sliding sleeve can respectively mesh with respective racks so that the two connecting rods connected to the sliding sleeve can rotate synchronously.

57. The bed frame according toclaim41, wherein the left longitudinal support bar, the right longitudinal support bar and the intermediate longitudinal support bar respectively comprise two main body sections and an intermediate section connected between the two main body sections, the main body sections and the intermediate section are connected via a connecting sheet, a support bar pivot shaft is mounted on the connecting sheet, the two main body sections are configured to be capable of rotating relative to each other about their respective support bar pivot shafts in a vertical plane relative to the intermediate section so that the bed frame is folded or unfolded in the vertical plane.

58. The bed frame according toclaim55, wherein the bed frame further comprises a locking mechanism for locking the main body sections relative to the intermediate section when the main body sections rotate to the folded or unfolded position in the vertical plane.

59. The bed frame according toclaim41, wherein the connecting rod comprises a plurality of bushing rods which are nested one inside another so that the connecting rod is telescopic in its extension direction.

60. The bed frame according to claim57, wherein in any two adjacent bushing rods, one bushing rod is provided with a first alignment hole, a ball end leaf spring with a protrusion is disposed in the first alignment hole, the ball end leaf spring is configured to extend out of the first alignment hole under action of an elastic force and retract back into the first alignment hole when subjected to a pressure, the other bushing rod is nested around a preceding bushing rod, a second alignment hole is disposed on a side face of the other bushing rod facing the first alignment hole, the second alignment hole is configured in a way that when the second alignment hole aligns with the protrusion, the protrusion can extend out under the action of elasticity, automatically enter the second alignment hole and thereby lock the two adjacent bushing rods relative to one another.

61. The bed frame according toclaim41, wherein the bed frame is configured to be engageable with a tongue member for mounting a bedhead member, the tongue member comprises a tongue, an upwardly open slot is provided at the end of the left longitudinal support bar and right longitudinal support bar, and the slot is configured to receive the tongue.

62. The bed frame according toclaim41, wherein the left longitudinal support bar, the right longitudinal support bar, and the intermediate longitudinal support bar are respectively provided with downwardly extending legs at both ends and in the middle.

63. The bed frame according to claim60, wherein the legs are also pivotally connected to respective longitudinal support bars, the legs are rotatable and foldable relative to the respective longitudinal support bars, and in the folded state the legs abut against the respective longitudinal support bars side by side.

64. A bed frame, comprising:

wherein the bed frame further comprises:

wherein the connecting rod is configured in a way that the end of the connecting rod mounted on the bracket moves along with the sliding sleeve when the sliding sleeve slides along the left longitudinal support bar or right longitudinal support bar, thereby driving the connecting rod to move on a horizontal plane such that the bed frame is in an unfolded state or a folded state; and

65. The bed frame according to claim64, wherein

66. The bed frame according to claim65, wherein the additional links comprise two additional links, and the two additional links are located on different sides relative to the intermediate longitudinal support bar, and one ends of the two additional links are respectively connected to opposing ends of the intermediate longitudinal support bar.

67. The bed frame according to claim64, wherein the additional links comprise four additional links.

69. The bed frame according to claim64, wherein the left longitudinal support bar or right longitudinal support bar is provided with a pin hole at positions close to its end portions and middle portion respectively and at a transition position between the end portions and the middle portion, respectively, a pin is disposed in the pin hole, and the pin is configured to extend out of the pin hole under the action of an elastic force and retract back into the pin hole when subjected to pressure.

70. The bed frame according to claim69, wherein a pin hole is also disposed on a middle position between the end portions and the middle portion, a pin is disposed in the pin hole, and the pin is configured to extend out of the pin holes under the action of an elastic force and retract back into the pin holes when subjected to pressure.

71. The bed frame according to claim70, wherein a receiving hole is disposed on a side of the sliding sleeve facing the pin hole, wherein the receiving hole is configured in a way that when the receiving hole is aligned with the pin, the pin can extend out under the action of its elasticity, and automatically enter the receiving hole to lock the sliding sleeve on the left longitudinal support bar or right longitudinal support bar.

73. The bed frame according to claim69, wherein the pin is a square pin or a round pin.

74. The bed frame according to claim69, wherein the pin holes are provided on an upper surface and/or a lower surface of the left longitudinal support bar or the right longitudinal support bar.

75. The bed frame according to claim64, wherein the bracket is mounted on the sliding sleeve, and the bracket is provided with a pivot shaft located on both lateral sides of the sliding sleeve and extending in a vertical direction, and the connecting rod is pivotally connected to the bracket via the pivot shaft.

76. The bed frame according to claim75, wherein the bracket comprises an upper plate mounted on an upwardly facing surface of the sliding sleeve and a lower plate fixedly mounted on a downwardly facing surface of the sliding sleeve, both lateral sides of the upper plate and lower plate respectively extend out of the sliding sleeve to form cantilevers, and the pivot shafts are connected between the cantilevers on the same side of the upper plate and lower plate.

77. The bed frame according to claim76, wherein the upper plate comprises two horizontal meshing plates which are respectively connected to two pivot shafts located on both lateral sides of the sliding sleeve, the meshing plates are in a sector shape and provided with a gear structure on an arcuate edge thereof, the gear structures of the two upper plates connected to one sliding sleeve face each other and can mesh with each other, thereby enabling synchronous rotation of the two connecting rods connected to the sliding sleeve.

78. The bed frame according to claim75, wherein an end of the connecting rod connected to the sliding sleeve has an upper side plate and a lower side plate which extend in the horizontal direction and face each other, and the pivot shaft is located between the upper side plate and the lower side plate, and

79. The bed frame according to claim78, wherein the upper side plate is formed as a partially circular shape, an edge of the circular shape is formed as a gear structure, a rack extending in the longitudinal direction is disposed on both lateral upper edges of the sliding sleeve respectively, the gear structures of two connecting rods connected to one sliding sleeve can respectively mesh with respective racks so that the two connecting rods connected to the sliding sleeve can rotate synchronously.

80. The bed frame according to claim64, wherein the left longitudinal support bar, the right longitudinal support bar and the intermediate longitudinal support bar respectively comprise two main body sections and an intermediate section connected between the two main body sections, the main body sections and the intermediate section are connected via a connecting sheet, a support bar pivot shaft is mounted on the connecting sheet, the two main body sections are configured to be capable of rotating relative to each other about their respective support bar pivot shafts in a vertical plane relative to the intermediate section so that the bed frame is folded or unfolded in the vertical plane.

81. The bed frame according to claim80, wherein the bed frame further comprises a locking mechanism for locking the main body sections relative to the intermediate section when the main body sections rotate to the folded or unfolded position in the vertical plane.

82. The bed frame according to claim64, wherein the connecting rod comprises a plurality of bushing rods which are nested one inside another so that the connecting rod is telescopic in its extension direction.

83. The bed frame according to claim82, wherein in any two adjacent bushing rods, one bushing rod is provided with a first alignment hole, a ball end leaf spring with a protrusion is disposed in the first alignment hole, the ball end leaf spring is configured to extend out of the first alignment hole under action of an elastic force and retract back into the first alignment hole when subjected to a pressure, the other bushing rod is nested around a preceding bushing rod, a second alignment hole is disposed on a side face of the other bushing rod facing the first alignment hole, the second alignment hole is configured in a way that when the second alignment hole aligns with the protrusion, the protrusion can extend out under the action of elasticity, automatically enter the second alignment hole and thereby lock the two adjacent bushing rods relative to one another.

84. The bed frame according to claim64, wherein the bed frame is configured to be engageable with a tongue member for mounting a bedhead member, the tongue member comprises a tongue, an upwardly open slot is provided at the end of the left longitudinal support bar and right longitudinal support bar, and the slot is configured to receive the tongue.

85. The bed frame according to claim64, wherein the left longitudinal support bar, the right longitudinal support bar, and the intermediate longitudinal support bar are respectively provided with downwardly extending legs at both ends and in the middle.

86. The bed frame according to claim85, wherein the legs are also pivotally connected to respective longitudinal support bars, the legs are rotatable and foldable relative to the respective longitudinal support bars, and in the folded state the legs abut against the respective longitudinal support bars side by side.

The above depictions of various embodiments of the present disclosure are provided to those having ordinary skill in the art for depiction purpose, and are not intended to exclude other embodiments from the present disclosure or limit the present disclosure to a single disclosed embodiment. As described above, various alternatives and modifications of the present disclosure will be apparent to those of ordinary skill in the art. Accordingly, although some alternative embodiments have been described in detail, those having ordinary skill in the art will understand or readily develop other embodiments. The disclosure is intended to cover all alternatives, modifications and variations of the present disclosure described herein, as well as other embodiments falling within the spirit and scope of the present disclosure described herein.